Jennifer Lopez, Pitbull - On The Floor (LaRCS, by DcsabaS, 2011)

"LaRCS" stands for "Live and Record Combined Stereo", which means that on the left side you can hear a live performance, while on the right side the video clip/studio version.
In this case you can enjoy "On The Floor" from Jennifer Lopez. On the right side you can see the official music video clip (featuring Pitbull), while on the left side a partially live version (live over pre-recorded vocals) from 2011. The last part of the video is a little chaotic, but previously fits sufficiently well.